[issue22841] Avoid to use coroutine with add_signal_handler()

[Roundup Robot]

Roundup Robot added the comment:

New changeset 44e77709daa4 by Guido van Rossum in branch 'default':
- Issue #22841: Reject coroutines in asyncio add_signal_handler().
https://hg.python.org/cpython/rev/44e77709daa4

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<http://bugs.python.org/issue22841>
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